Question

(1) cos 38° cos 52° - sin 38° sin 52° = 0
2 Show that:
tan 48°tan 23° tan 42° tan 67° = 1
or​

Answer 1

Step-by-step explanation:

cos38°*cos52°-sin38°*sin52°

if a+ b=90°

then cosa. cosb=0

0-0=0

tan48°.tan23°.tan42°.tan67°

if a+ b=90°

then tanA. tanB=1

1.1=1

Answer 2

Answer:

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Step-by-step explanation:

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